When a person (man or women) places their nose between the two testicles of the scrotum sack and proceeds to nestle with them. A back and forth motion is preferred, however, some have advanced to circular motions or just plain improvisation. Heed this warning, if the ballnose is executed with a large, fruitful mustache, it will tickle.
Person 1: Who would you rather be ballnosed by; Mary or Craig?
Person 2: Probably Craig because his mustache would tickle.